Universal adjustable head, neck, and back support



FIG. 1 is a front perspective view of a universal adjustable head, neck, and back support showing my new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a top view thereof,

FIG. 4 is a bottom view thereof,

FIG. 5 is a right view thereof; and,

FIG. 6 is a left view thereof.

In the drawings, the broken lines represent stitching forming part of the claimed design. 

The ornamental design for a universal adjustable head, neck, and back support, as shown and described. 